In the word reiterate, the letters R, E and T appear in all possible orders: REiTerate, ReiTErate, rEiTeRate, rEiteRaTe, reiTERate, and reiTeRatE. This property is not particularly unusual, being shared by thousands of Websterian words. The shortest letter sequences possessing this property are seven letters long.
Eckler, A. Ross
"All Letter-Orders in a Word,"
Word Ways: Vol. 17
, Article 15.
Available at: http://digitalcommons.butler.edu/wordways/vol17/iss4/15